Holy cow   Sounds like maybe the muffler pipe or something along there rattling against the car or a metal shield or something. Sounds like a rather thin piece of metal is doing the vibrating. Others with SDL's will probably know better what it could be....
That engine sounds sweet though! Makes me want one.....(only in addition to the SD/617 though)
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-diesel is not just a fuel, its a way of life- 
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